What’s an Important Update?

Windows update runs (good).

Windows update classifies some updates as important, and some updates as optional (good).


Windows update decides that a Silverlight update is important. It appears security related (good) but also add features (maybe good, maybe bad).


Windows update decides that a security definition update is optional (bad).SNIP2

How can a definition update for a signature based security product be optional? That’s annoying, ‘cause now I have to make sure to check optional updates just in case they’re important.